Circulating fluidized bed screening and crushing device and application method thereof

The invention discloses a circulating fluidized bed screening and crushing device and an application method thereof. The circulating fluidized bed screening and crushing device adopts a fan (1), a positive pressure circulating pipe (2), a screen barrel branch and a negative pressure circulating pipe (6) to form a circulating passage, and a material forms a fluidized state under the effect of the fan (1), is crushed when flowing at high speed in a circulating manner in the circulating passage, and is screened by a screen barrel (3) and a screen barrel (4). The circulating fluidized bed screening and crushing device is simple in structure, reliable in work and high in efficiency.